MEMS Piezoelectric (Voltage vs. Eigenfreq)
Hi, I am changing the voltage across the piezoelectric beam actuator I've created. I expect to see a different set of eigenfrequency numbers when I change the voltage. However, the numbers remain the...
View ArticleRelation Eigenvalue/Eigenfrequency problem
I am currently investigating two-dimensional dielectric cavities and their electromagnetic TM/TE eigenmodes. For these studies I use the "Electromagnetic Waves" module while only considering the...
View ArticleCantilever Strain at Resonance Frequencies
Hello, I am new to Comsol and am trying to simulate strain in various structures at their eigenfrequencies. I have no problem finding the eigenfrequencies, but the amplitude in the eigenfrequency study...
View ArticleRelative Energy from Eigenfrequency Analysis
Hello All, I have been working with COMSOL 4.0 (mostly heat transfer modules) but now need to analyze a structure with an eigenfrequency analysis. I can generate the model and the eigenfrequency(s),...
View ArticleRigid connector as rotation sensor
Hello, I'm trying to use the rigid connector as an angle sensor, but I'm having troubles interpreting the values. In my case I have a 3D solid mechanics simulation of an object, and I apply a rigid...
View ArticleRigid-body Μodes
Hello guys. I am using Comsol more and more these days, so you will be hearing from me regularly from now on. I hope we'll have a nice chat. To the point now: In Eigenfrequency Analysis of a system, is...
View ArticleQuestion about complex frequencies
Hi! I'm simulating a MEMS resonator using Thermoelasticity and an eigenfrequency study. As might be expected, I'm obtaining complex frequencies due to the damping. I looked all over the forum and the...
View ArticleEigenfrequency Error "Cannot evaluate expression"
I am trying to compute the Eigenfrequency physics for a mesh I created and imported into COMSOL. The mesh is 3D, complex, and asymmetrical but I have had no problems computing with it in other studies....
View ArticleVelocity in Eigenfrequency Study
I trying to compute the eigenfrequecies and eigenmodes of a model. I have computed the Eigenfrequency study correctly. However, when I look at the generated values for the velocity (local RMS velocity,...
View ArticleVelocity in Eigenfrequency Study
I trying to compute the eigenfrequecies and eigenmodes of a model (material is water) in the pressure acoustics and frequency domain. I have computed the Eigenfrequency study correctly. However, when I...
View ArticleEigenfrequency with change in temperature
I have a gold beam fixed at both the ends. I would like to know the eigenfrequency(resonance frequency) of the beam with change in temperature(cooling the surroundings), please help me how to do that,...
View ArticleSymmetric meshing
Dear all, I'd like to learn if it is possible to have symmetry axis in mesh. I'm working on a 3D model, and the geometry is symmetric in both x and y axis. I'm studying on eigenfrequency analysis and...
View ArticleLumped Capacitor in the RF Module, eigenfrequency
Hello all, I'm using 4.4, and I realize it is impossible to add Lumped Capacitor and Lumped Inductor in RF Module Eigenfrequency study. (but lumped elements with Z value is possible, and Lumped...
View ArticleSolid and Fluid motion with eigenfrequency study
Hello, I made a very simple geometry in 2D, such as the cross-section of a microcapillary. I want to find some eigenfrequency which can make a few modes on a microcapillary. So, for the shell I used...
View ArticleEigenfrequency analysis problem
Hi, I'm dealing with a nano rod vibration. I want to know the displacement of some point on the eigen mode. (0.5 L, 0.125 L, .....) However, I found that I can't find the same value that is I will get...
View Articlesome question in eigenfrequency .
Hi I used solid mechanics modeI and I have some confusions about the eigen frequency,so can you give some sugggestions?Any reply I will be very grateful. Questions： 1、I just used solid mechanics mode...
View ArticleEigenvalue Solver Warning
Hello, I am running the eigenfrequency study in the Acoustics module, and received a warning in Comsol that I have previously not encountered:"Extra interior eigenvalue found. Decrease the size of the...
View ArticleHow to set orientation of silicon
I would like to simulate 3D solid mechanics eigenfrequency study, with just simple rectangular waveguide. My rectangular waveguide is just 400um x 80um x 40um, I set Fixed constraints at both end, and...
View ArticleEigenfrequencies
Hej I did a eigenfrequency analysis of a simple supported beam in COMSOL and matlab. Although I get the exact same (almost the same) results from both programes, there is still a difference in the...
View Articleeigenfrequency study wineglass model (water-glass boundary condition)
Hello, I am studying how the eigenfrequencies of a wineglass change when you add differents amounts of water to the glass. I can easily model it when the glass is empty (without any water) and get the...
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